Single-walled carbon nanotubes (SWCNT) functionalized with amino groups were prepared via chemical modification of carboxyl introduced on the nanotube surface. Two different approaches (amide and amine-moieties) used to produce amino-functionalized nanotubes. The amino-termination allows further chemistry SWCNTs makes possible covalent bonding polymers biological systems such as DNA carbohydrates. functionalization was characterized in detail using FTIR XPS.

Vibration energy harvesting is an attractive technique for potential powering of wireless sensors and low power devices. While the can be employed to harvest from vibrations vibrating structures, a general requirement independent transfer mechanism that vibration device operate in resonance at excitation frequency. Most devices developed date are single frequency based, while recent efforts have been made broaden range devices, what lacking robust tunable technique. In this paper, design...

Chemically functionalized multiwalled carbon nanotubes were incorporated into a polymer matrix by in situ polymerization, to improve the transfer of mechanical load through chemical bond, which was demonstrated Raman and infrared spectroscopies. The resulting composite shows higher storage modulus (E') tensile strength than existing similar composites, with only 1 wt % nanotubes. E' at 90 °C is increased an outstanding 1135% glass transition temperature exceptionally raised ≅40 °C.

Recent experimental results demonstrate that substantial improvements in the mechanical behavior of polymers can be obtained using very small amounts carbon nanotubes as a reinforcing phase. Here, method is developed to incorporate typically observed curvature embedded into traditional micromechanical methods for determination effective modulus nanotube-reinforced polymer. Using combined finite element and approach, it was determined nanotube significantly reduces reinforcement when compared...

A series of observations polymer sheathing in multiwalled carbon nanotube (MWCNT)−polycarbonate composites are presented. This was observed images the composite fracture surface and is consistent with diameter distributions as-received embedded MWCNTs. novel nanomanipulation experiment, where balls up when contacted by an AFM tip, confirms this phenomenon. layer direct evidence substantial MWCNT−polymer interaction will influence mechanical properties MWCNT-polymer composites.

Vibration energy harvesting is being pursued as a means to power wireless sensors and ultra-low autonomous devices. From design standpoint, matching the electrical damping induced by mechanism mechanical in system necessary for maximum efficiency. In this work two independent techniques are coupled provide higher within system. Here device consists of primary piezoelectric which an electromagnetic component added better match total The first has resonance frequency 21.6 Hz generates peak...

Future deployment of wireless sensor networks will ultimately require a self-sustainable local power source for each sensor, and vibration energy harvesting is promising approach such applications. A requirement efficient to match the device frequencies. While techniques tune resonance frequency an have recently been described, in many applications optimization systems be able autonomously its frequency. In this work with autonomous tunability utilizing magnetic stiffness technique...

This paper describes the fabrication and characterization of a hybrid nanostructure comprised carbon nanotubes (CNTs) grown on graphene layers for supercapacitor applications. The entire (CNTs graphene) was fabricated via atmospheric pressure chemical vapor deposition (APCVD) designed to minimize self-aggregation CNTs. Growth parameters CNTs were optimized by adjusting gas flow rates hydrogen methane control simultaneous, competing reactions formation toward CNT growth hydrogenation which...

Microporous polyvinylidene fluoride (PVDF) and PVDF nanocomposite membranes were prepared via an isothermal immersion precipitation method using two different antisolvents (ethanol water). The structure morphology of the resulting investigated by wide angle X‐ray diffraction (WAXD), Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), differential calorimetry (DSC). effects type antisolvent presence multiwalled carbon nanotubes (MWNTs) on membrane crystal...

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Abstract NOTE: The first page of text has been automatically extracted and included below in lieu an abstract Session 2793 A Tool to Measure Adaptive Expertise Biomedical Engineering Students Frank T. Fisher, Penelope L. Peterson Department Mechanical / School Education Social Policy, Northwestern University, Evanston, IL 60208 While engineering programs must continue cover the maximum breadth depth content information possible, these can also take active role encouraging fostering...

Composites were prepared by using carbon nanotubes (CNTs) and methyl-ethyl methacrylate copolymer, modified with nonionic surfactant to improve the nanotube dispersion workability. The thermal results show that polymer glass transition temperature increases up 10°C only 1wt% CNT content improves mechanical response more than 200%, substantially above other reports where large quantities of CNTs used.

Abstract There is growing interest in the incorporation of nanoparticles into engineering polymers to improve various functional properties. However, ultimate properties nanocomposites are affected by a large number factors including microstructural distributions that generated during processing. In this work, polyamide‐11 (PA‐11) (also known as nylon‐11) with carbon nanostructures employing solution crystallization technique at multiple polymer and nanoparticle concentrations, followed...

Interfacial properties are known to have a critical effect on the mechanical of nanocomposite material system. Here, interfacial load transfer in carbon nanotube (CNT)/nylon-11 composite was studied with CNT/nylon-11 nanohybrid shish kebab (NHSK) structure modification using Raman spectroscopy. Characterization polymer crystal NHSK differential scanning calorimetry (DSC) for first time indicates that formed more perfect than bulk polymer. On basis transmission electron microscopy and DSC...

Poly(vinylidene fluoride) (PVDF) is a semicrystalline thermoplastic polymer that of interest for sensor, actuator and biomedical applications because its piezoelectric pyroelectric properties, as well outstanding mechanical chemical properties. Although it known the shear-induced crystallization behavior nanocomposites can be significantly affected by presence nanoparticles, effects incorporation carbon nanotubes on deformation-induced associated morphology development PVDF have not been...

The effects of the incorporation multiwalled carbon nanotubes (MWNT) with a diameter range 10−30 nm on shear-induced crystallization behavior poly(butylene terephthalate) (PBT) were investigated under myriad shearing and loading conditions employing principally small-amplitude oscillatory shear flow. Upon shearing, presence MWNTs leads to PBT nanocomposites at temperatures that are higher than temperature unfilled PBT. Avrami analysis data nanocomposite samples indicated kinetics depend both...

In most envisioned applications, the full utilization of a graphene-carbon nanotube (CNT) construct requires maintaining integrity graphene layer during CNT growth step. this work, we exhibit an approach toward controlled atop substrates where reaction equilibrium between source hydrocarbon decomposition and carbon saturation into precipitation from catalyst nanoparticles shifts rather than consumption. By utilizing C2H4 feedstock, demonstrate that low-temperature permissible with gas...

The authors present a high-throughput fabrication technique to create large-area graphene nanomesh (GNM). A patterned negative photoresist layer was used as an etch mask atop chemical vapor deposition grown on Cu foil. Shielded by the periodic nanopatterned mask, selectively etched using O2 plasma, forming GNM layer. poly(methyl methacrylate) spun copper foil, and subsequently transferred onto SiO2/Si substrate etching away Large-area (5 × 5 cm), (500 935 nm in pitch), uniform, flexible GNMs...

Stretchable electrodes are a critical component for flexible electronics such as displays, energy devices, and wearable sensors. Carbon nanotubes (CNTs) graphene have been considered electrode applications, due to their mechanical strength, high carrier mobility, excellent thermal conductivity. Vertically aligned carbon (VACNTs) provide the possibility serve interconnects sheets stretchable that could maintain electrical conductivity under large tensile strain. In this work, oxide (GO)-VACNT...

Vibration-based energy harvesting seeks to convert ambient vibrations electrical and is of interest for, among other applications, powering the individual nodes wireless sensor networks. Generally it desired match resonant frequencies device vibration source optimize harvested. This paper presents a two-dimensionally (2D) tunable vibration-based via application magnetic forces in two-dimensional space. These are accounted for model separately, with transverse force contributing stiffness...